Improvement in milling-machines



A.HI.BRA1NARD. Improvement in Milling-M-alchines. NO.. 131,733. lPatented Oct. t, 1872.

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` A. H. BRAINARD. Improvement in Milling-Machines.V N\o.131,733.

Patented Oct. l, 1872.

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Improvement in Milling-Machines. No.. 13l,733.]` V Patented 0t.1,1872`.

State of Massachusetts, have invented certain outer end of themill-spindle5 also in the ar- 5, and spindle a at all times, asdescribed.

' ever they occur on the drawing.

L Vtion of the machineyFig. 2 is a central longithe pinion e, as shown.

`arrangement of back-gearing on lathes and Anos vn. Balmain), or HYDErknk, nksskcnfusnrrs.

` a IMPROVEMENTIN Mauna-MACHINES.

Specification forming part of Letters Pate To all whont it may concern:

Be it known that I, AMos H. BRAINARD, of Hyde Park, *in the county ofNorfolk and new and useful Improvements on Milling-Machines, of whichthe. following is a specification:

N more and Ubjects of the Invention.

The nature of my invention relates to improvementson milling-machines,which consist in the arrangement of certain mechanism making an`adjustable central support for the rangement of mechanism for supportingand disengaging the worm from the worm-wheel, as described; also in thearrangement of mechanism that permits the table to be raised Yorlowered, `and still connect the feed-screw 16, shaft Similar lettersrefer to similarv parts wher- On the drawing, Figure l is a frontelevatudinal section over the line A B. taken on Fig.l; Fig. 3 is a rearview; Fig. 4 is an enlarged end view of the support for the millspindle,`and Fig. 5 is a central longitudinal section over the line G D taken onFig. 4; Fig. 6 is a ground plan of the nut for the horizontal feed, andFig. 7 is a section over the line E Ftaken on Fig. 6; Fig. 8 iis a sideview of the horizontal feed-shaft, and Fig. 9 is central longitudinalsection over the bearings taken on Fig. 8. y

a on Fig. 2 is ahollow spindle, movable `in bearingsb b attached to thestandard c. Around the hollow spindle a is the movable cone-pulley d; tothe cone-pulley d is firmly attached On. the hollow spin dle ais firmlykeyed the spur-wheel j', that is made to engage with the pinion g, Fig.l, movable around the Vback-gear shaft h. The pinion c is made to engagewith the spur-wheel t', that y is also `movable with the pinion g aroundthe shaft hinthe'manner similar to the drilling-machines. f The wheels gt' may be disengaged from the wheelscf when great speed is required forthespindle a, in which instance the wheel f has to be coupled to thecone-pulley d in the usual way. The forward end of the hollow spindle ais conical on the outside, and

nt No. 131,733, dated octber 1,1812.

thebearing for it is made correspondingly, and

provided with two check-nuts, k k,in each end, as shown, whereby theslack may be taken up as the spindle'a wears in its bearings. .Theextreme forward end of the spindle a is made with an externalscrew-thread, over which a chuck or face plate may be screwed, as may beneeded, for certain kinds of work. 'lhe milllspindle Z is driven in thetapering hole in the forward end ofthe hollow shaft a, and the mill mmay be secured thereto in any suitable way; but to prevent thechatteringfof the mill-spindle l I provide a support, n, clamped overthe circular part o of the supporting aarched frame p, as shown. Thearchedframe p is bolted on the upper side of the bearings b b, by whicharrangement I obtain a strong brace for the bearings b b, whereby themachine is made to operate steadier, without chattering. The support nis shown in enlarged scale in Figs. 4 and 5. The upper part of thissupport is a circular split ring provided with ears g g, that can beclamped together by thescrew fr going through one of the ears freely andscrewed in the other ear, as shown in Fig@ 4. Through the lower end ofthe sup-` port n is the adjustable piece s, inserted as shown, andsituated in an oblong opening,

which has Vertical sides ruiming parallel. The piece s has in one endacollar, and over the other end is the `nut t screwed, whereby the pieces can be held firmly in place after it is onceadjusted. The whole of thepieces is tapped through, and a center-bolt, n, screwed through it, asshown. The bolt n is provided with a head in the extreme outer end,andhas a Vcheck-nut, e, attached, whereby it .can be held firmly in placewhere desired. The piece s, with the center-bolt n, can be adjusted upor down by means of the set-screw w and the coiled spring x lying in thesupport n, `as shown, or the coiled spring and set-screw may bedispensed with and the piece s adjusted by l Figs. 2 and 3. The train ofgears y, z, and 1 are supported in bearings in the arm 3, the upper endof which is slipped over the hollow spindle a, as shown. Acone-pulley,4, is keyed on the shaft 2 for the purpose of conducting the motion tothe feed-shaft 5, on which a similar cone-pulley, 6, is keyed, as shownin detail in Figs. 8 and 9. A groove, 7, is cut lengthwise on the shaft5, and a corresponding key fixed in the worm 8, by which arrangement theworm 8 can be moved out or in on the shaft 5 and still be attached tothe said shaft. The worm 8 is movable in a bearing, 9, and to preventthe worm from slipping out of the bearing 9 I provide it with a iiange,1() 10, on each side of the bearing 9, as shown in Fig. 9. The bearing 9is provided with a projection, 11, that rests on a hooked finger, 12,(Fig. 1,) and the bearing 9 is also made to swing around a bolt, 13,attached to the carriage 14. The worm 8 engages with the worm-wheel 15attached to the feed-screw 16, as shown. The object of the projection 11on the bearing 9 and the hooked finger 12 is so as to readily disen gagethe worm 8 from the worm-wheel 15, when it is desired to feed thescrew16 byhand instead of automatically by power. For the purpose ofdisengaging the worm 8 from the worm-wheel 15 I remove the hold of thefinger 12 on the proj ection 11 either by hand or automatically by meansof the dog 17 attached to the table 18, when the outer end of the shaft5 drops down far enough to prevent the worm 8 from engagement with theworm-wheel 15. ,For

this purpose I have also arranged the rear bearing 19, which supportsthe shaft 5, so as to turn around with the bolt 20, which projectsthrough the bracket 21, as shown. The hooked inger 12 is held in placeby means of the spring 22, or equivalent, as shown in Fig. 1. The shafts2 and`5 are connected together by means of the brace 23 and 24, providedwith an eye in each end, through which the shafts pass, as shown in Fig.3. The end of the brace 24 is bored out, so as to receive thecylindrical end of the brace 23, and they are attached firmly togetherby means of the setscrews 25, as shown. The object of this arrangementis to tighten and take up the slack of the belt 26 as it is stretched bythe operation of the machine. The carriage 14 is movable in and out in ahorizontal direction over V-guides attached to the supporting-bracket27, and operated by means of the screw 28 and nut 29, as shown in Fig.2. The supporting-bracket 27 is movable up and down in a verticaldirection over V-guides attached to the standard c, and raised orlowered by means of the screw 30 operated by the bevel-gears 3l 32 andshaft 33, to which a portable crank is secured during operation. Theupper side of the carriage 14 is also provided with V- guides, in whichthe table 18 is made to slide forward and back. The table 18 is providedall round with a groove, 34, in which the waste oil can be collected anddrawn off into a suitable vessel, so as to be used over again. Under thetable 18 is the nut 35 36, made in two halves, attached to the table bymeans of the two screws 37 37, in the manner shown in Figs. 6 and 7.Through the table 18 holes are bored and tapped for the screws 38 38 3838, that are screwed through the table 18 and made to press against theupper side of the nut 35. Through the half nut 36 holes are bored andtapped for the screws 39 39 39 39, that are screwed through the nut 36and press against the under side of the nut 35, as shown in Fig. 7. Theobject of the bolts 37 38 39 is to keep the nut 35 36 central with thescrew 16, and to hold the two parts of the nut rigidly apart as far asneeded for the free and easy motion of the feed-screw 16, and also toadmit of adjustment as the thread of the screw wears. The upper part ofthe table 18 is cut through with T-headed grooves going at right anglesto each other, wherein bolts may be slipped for the purpose of holdingthe work firmly on the table 18 during the operation of my machine.

The operation of my machine is as follows: After the work is firmlyattached on the table 18 and a suitable mill, m, attached to themillspindle Z, and the said spindle lgiven a rotary motion, I move thework up or down, out or in, or sidewise, as may be required according tothe nature of the work that is to be done, the respective movements ofthe carriage 14 being executed by means of the different partshereinabove described, and in the manner as shown on the drawing.

Having thus fully described the nature, construction, and operation ofmy invention, what I wish to secure by Letters Patent, and claim, is-

1. In combination with the adjustable center-rest n, the adjustable heads, screwed center-pin u, check-nut c, and set-screw w, when all arearranged and combined as and for the purpose herein set forth anddescribed.

2. rI"he arrangement for supporting and disengaging the worm 8 from theworm-wheel 15, consisting in the pivoted bearing 9, provided with theprojection 11, hooked finger 12, spring 22, dog 17, and pivoted bearing19, in a manner and for the purpose set forth.

3. In combination with the spindle a, the pivoted arm 3, gears y z 1, ortheir equivalents, pin 2, pulleys 4 and 6, adjustable connection 23 and24, feed-shaft 5, feed-screw 16, and the table 18, as and for thepurpose set forth.

4. In combination with the feed-screw 16 and its divided nut 35 and 36,the arrangement of the adjusting-screws 37, 38, and 39, by which the nut35 36 can be adjusted centrally with the feed-screw 16, in a manner asherein set forth.

AMOS H. BRAINARD.

yWitnesses:

WM. H. HUrcHINsoN, ALBAN ANDREN.

